M4e1 Assembled Gen 2 Upper Receiver 16 Carbine Length

The M4E1 Assembled Gen 2 Upper Receiver 16 Carbine Length from Aero Precision is purpose-built for shooters and operators who demand precision, reliability, and modularity in their AR platform rifles. Developed with input from tactical professionals and field-tested in demanding environments, this upper receiver serves as the foundation for custom rifles, duty weapons, and precision carbines across law enforcement, military, and civilian markets. The carbine-length gas system paired with a 16-inch barrel delivers the optimal balance of velocity, handling, and accuracy for close-quarters engagements and mid-range precision work.

Aero Precision's Gen 2 platform incorporates enhanced forward assist geometry and refined upper receiver tolerances that reduce carrier tilt and improve bolt carrier group cycling consistency under sustained fire. The assembly is fully assembled and function tested, ready to accept your choice of charging handle, optics mount, and handguard, allowing complete customization without compromising fit or finish. At 4.8 pounds, the M4E1 upper contributes minimal weight to the receiver group, enabling faster target transitions and reduced shooter fatigue during extended operations.

The Aero Precision machining and Type III hard-coat anodize finish provide corrosion resistance and durability across harsh field conditions, from high-desert environments to maritime salt spray exposure. This upper receiver pairs seamlessly with any mil-spec lower receiver and standard AR-platform components, making it an excellent choice for anyone looking to build a reliable and versatile firearm.